Security Basics mailing list archives
Re: ethereal capture
From: Matt Simmons <matts () wirefire com>
Date: Thu, 18 Sep 2003 08:34:39 -0400
Hi. When you're sniffing a switched segment, then yes, ideally you will only see your traffic, plus broadcast traffic. However, if you configure the Cisco switch to monitor other ports into your specific port, then you will see all traffic, providing that your network card is in Promiscuous mode. The key is to tell the switch that you want to recieve all the traffic, otherwise it will only give you frames destined for your MAC address. Hope I was able to help. --Matt -- ------------------- Matt Simmons Assistant Network Administrator 304.580.8080x5007 Fibernet LLC On Wednesday 17 September 2003 07:17 pm, Cat Thrasher wrote:
Hi, Please advise on my question. I thought when you are sniffing a switched segment, you are only seeing broadcast traffic. I see source Workstation(not the one I am monitoring on)--Dest Webserver inside on my network and protocol http. Please tell me if this is usual. I have ethereal on a laptop. I did a port monitor on a Cisco Switch and captured traffic from one port. (so I thought) I thought I'd only see what the workstation on port fast ethernet 0/ 38 was doing. But like I said above, I see lots of http conversations and tcp conversations where the dest port is not all F's, or 255's. And the source is not the workstation on the port I am monitoring. Thanks alot. Cat Thrasher
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Current thread:
- ethereal capture Cat Thrasher (Sep 17)
- Re: ethereal capture Matt Simmons (Sep 18)
- Re: ethereal capture ericbrouwers (Sep 22)
- <Possible follow-ups>
- RE: ethereal capture Tenorio, Leandro (Sep 18)
- RE: ethereal capture Hagen, Eric (Sep 18)
- RE: ethereal capture Fields, James (Sep 18)